Pre-U CAIE Chemistry: Quick Memorisation Guide for Key Terms | Pre-U CAIE 化学：重点术语速记指南

📚 Pre-U CAIE Chemistry: Quick Memorisation Guide for Key Terms | Pre-U CAIE 化学：重点术语速记指南

Mastering chemical terminology is half the battle in Pre-U CAIE Chemistry. This guide pairs essential terms with memory aids, etymological roots, and pattern recognition to help you recall definitions, formulas, and concepts with speed and precision.

掌握化学术语是拿下 Pre-U CAIE 化学的关键。这份指南将核心词汇与记忆诀窍、词源拆解和规律识别相结合，帮你在回忆定义、公式与概念时又快又准。

1. Atomic Structure Terms | 原子结构术语速记

Think of the atom as a solar system in miniature — the nucleus is the sun, and electrons are planets in specific orbits (shells). The term atomic number (Z) equals the number of protons; mass number (A) is protons plus neutrons. To remember isotopes, think ‘iso-‘ (same) + ‘topos’ (place): same element, different mass. The first ionisation energy is the energy needed to remove one mole of electrons from one mole of gaseous atoms. Visualise pulling the outermost electron away against nuclear attraction.

将原子想象成微缩太阳系——原子核是太阳，电子是在特定轨道（壳层）上的行星。原子序数（Z）等于质子数；质量数（A）是质子加中子。记同位素，想 ‘iso-‘（相同）+ ‘topos’（位置）：同种元素，不同质量。第一电离能是从 1 摩尔气态原子中移除 1 摩尔电子所需的能量。想象将最外层电子从核引力中拉走。

2. Chemical Bonding & Structure | 化学键与结构术语

For ionic bonding, picture a give-and-take of electrons between a metal and a non-metal, forming a giant ionic lattice. Covalent bonding is sharing: think ‘co-‘ (together) + ‘valent’ (strength). Use the phrase ‘electronegativity pulls the cloud’ for polar bonds. Metallic bonding can be recalled as ‘a sea of delocalised electrons’ around positive metal ions. The coordination number is simply the number of nearest neighbours in a crystal lattice — count the contacts.

对于离子键，想象金属与非金属之间电子的给予和接受，形成巨型离子晶格。共价键是共享：想 ‘co-‘（共同）+ ‘valent’（力量）。记极性键用短句“电负性拉扯电子云”。金属键可记为“正金属离子周围的离域电子海”。配位数就是晶格中最近邻粒子的数量——数一数接触点。

3. Energetics & Thermodynamics | 能量学与热力学

Enthalpy change (ΔH) is heat change at constant pressure — associate ‘H’ with ‘heat’. Exothermic: exit heat (ΔH negative); endothermic: enter heat (ΔH positive). Hess’s Law states enthalpy change is independent of route; picture climbing a mountain — the altitude gain is the same regardless of path. Entropy (S) measures disorder: more microstates, larger S. Link ‘entropy’ to ‘tropical’ — spreading, messier. Gibbs free energy: ΔG = ΔH – TΔS; ‘Go get some free energy’ reminds you spontaneous when ΔG < 0.

焓变 (ΔH) 是恒压下的热变化——将 ‘H’ 联想为 ‘heat’。放热：热出去（ΔH 负）；吸热：热进来（ΔH 正）。赫斯定律说焓变与途径无关；想象爬山——无论哪条路，海拔提升相同。熵 (S) 度量混乱度：微状态越多，S 越大。把 ‘entropy’ 联想为 ‘tropical’——散开、更乱。吉布斯自由能：ΔG = ΔH – TΔS；’Go get some free energy’ 提示当 ΔG < 0 时反应自发。

4. Kinetics & Equilibria | 动力学与平衡

Rate of reaction is change in concentration per unit time. The rate constant (k) appears in the rate equation: rate = k[A]ᵐ[B]ⁿ. Think ‘k sets the pace’. Activation energy (Eₐ) is the minimum energy for a collision to be effective — picture a barrier over which molecules must jump. For dynamic equilibrium, forward and backward rates are equal, not concentrations. Le Chatelier’s principle: if a system at equilibrium is disturbed, it shifts to oppose the change; remember ‘Le Chatelier likes to cancel the change’. Kc is the equilibrium constant expressed in concentration; its magnitude tells where the equilibrium lies.

反应速率是单位时间内浓度的变化。速率常数 (k) 出现在速率方程：rate = k[A]ᵐ[B]ⁿ；想成“k 定步伐”。活化能 (Eₐ) 是有效碰撞的最小能量——想象一道分子必须跳过的屏障。动态平衡指正逆反应速率相等，而不是浓度相等。勒夏特列原理：若平衡系统受到扰动，会向减弱变化的方向移动；记住“勒夏特列喜欢抵消变化”。Kc 是以浓度表示的平衡常数；其大小表明平衡位置。

5. Redox & Electrochemistry | 氧化还原与电化学

Redox is a combination of reduction and oxidation. Use ‘OIL RIG’: Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons). Oxidation number is the hypothetical charge on an atom if all bonds were 100% ionic. In a half-equation, separate the oxidation and reduction processes. For electrochemical cells, remember ‘AN OX, RED CAT’: ANode is where OXidation occurs, REDuction happens at the CAThode. The standard electrode potential (E⁰) measures the tendency of a species to be reduced; more positive means stronger oxidising agent.

氧化还原是 还原 与 氧化 的结合。用“OIL RIG”：氧化是失电子，还原是得电子。氧化数是假设所有键 100% 离子性时原子上的虚电荷。半反应式分别表示氧化和还原过程。对于电化学电池，记住“AN OX, RED CAT”：阳极发生氧化，阴极发生还原。标准电极电势 (E⁰) 衡量物质被还原的趋势；越正意味着越强的氧化剂。

6. Organic Nomenclature & Functional Groups | 有机命名与官能团

Organic names follow a systematic logic: prefix–parent–suffix. The parent chain is the longest continuous carbon chain. Functional groups determine the suffix or prefix. Learn the priority order: carboxylic acid > ester > aldehyde > ketone > alcohol > amine. Use mnemonic ‘Cats Eat All Kind of Ants’. For homologous series, alkanes (CₙH₂ₙ₊₂), alkenes (CₙH₂ₙ), alkynes (CₙH₂ₙ₋₂). Isomerism: structural isomers have different structural formulas; stereoisomers have the same structural formula but different spatial arrangement, including E/Z and optical isomers.

有机命名遵循系统逻辑：前缀–母体–后缀。主链 是最长的连续碳链。官能团决定后缀或前缀。学习优先级顺序：羧酸 > 酯 > 醛 > 酮 > 醇 > 胺。用“Cats Eat All Kind of Ants”助记。对于同系列，烷烃 (CₙH₂ₙ₊₂)，烯烃 (CₙH₂ₙ)，炔烃 (CₙH₂ₙ₋₂)。异构现象：构造异构体结构式不同；立体异构体结构式相同但空间排列不同，包括 E/Z 异构和光学异构。

7. Reaction Mechanisms & Types | 反应机理与类型

A mechanism shows the step-by-step bond breaking and making. Homolytic fission gives two radicals (one electron each); heterolytic fission gives a cation and an anion (two electrons to one atom). Nucleophiles are electron-rich, seeking positive centres; ‘nucleo-‘ like nucleus (positive) is misleading: actually it loves nucleus → it loves positive. Electrophiles are electron-poor, seeking negative centres. In addition polymerisation, monomers add without loss of small molecules. Condensation polymerisation involves loss of small molecules like H₂O or HCl.

机理 展示逐步的键断裂与形成。均裂产生两个自由基（各得一个电子）；异裂产生一个正离子和一个负离子（两个电子归一个原子）。亲核试剂 富电子，寻找正电中心；’nucleo-‘ 似核（正电），有误导性：实际它“爱核”→爱正电。亲电试剂 缺电子，寻找负电中心。加成聚合中，单体相互加成不丢失小分子。缩合聚合涉及丢失小分子如 H₂O 或 HCl。

8. Inorganic Chemistry Terms | 无机化学术语

Periodicity refers to repeating trends in the Periodic Table, such as atomic radius and ionisation energy. Group 2 elements are the alkaline earth metals; Group 17 are halogens (salt-formers). The d-block elements are transition metals, often forming coloured compounds and acting as catalysts. Ligand: a molecule or ion that donates a lone pair to a central metal ion to form a complex ion. The coordination number in complexes is the number of coordinate bonds. Disproportionation is when an element is simultaneously oxidised and reduced in the same reaction.

周期性指元素周期表中重复的变化趋势，如原子半径和电离能。第 2 族是碱土金属；第 17 族是卤素（成盐者）。d 区元素是过渡金属，常形成有色化合物并作催化剂。配体：提供孤电子对给中心金属离子形成配离子的分子或离子。配合物中的配位数是配位键数量。歧化反应指同一反应中某元素同时被氧化和还原。

9. Physical Chemistry Constants & Formulas | 物理化学常数与公式

Key constants often appear: the Avogadro constant (Nₐ = 6.02 × 10²³ mol⁻¹) links particles to moles. The ideal gas equation pV = nRT can be recalled by ‘People Visit the Northern Region Tonight’. For pH = –log₁₀[H⁺], note that lower pH means higher acidity. The Ionic product of water, Kw = [H⁺][OH⁻] = 1.0 × 10⁻¹⁴ mol² dm⁻⁶ at 298 K. Buffer solutions resist pH change; think of a ‘chemical cushion’. The Arrhenius equation k = Ae^(–Eₐ/RT) shows how rate constant changes with temperature.

常见关键常数：阿伏伽德罗常数 (Nₐ = 6.02 × 10²³ mol⁻¹) 连接粒子数与摩尔。理想气体方程 pV = nRT 可用“People Visit the Northern Region Tonight”回忆。pH = –log₁₀[H⁺]，注意 pH 越低酸性越强。水的离子积 Kw = [H⁺][OH⁻] = 1.0 × 10⁻¹⁴ mol² dm⁻⁶ (298 K)。缓冲溶液 抵抗 pH 变化；想成“化学垫子”。阿伦尼乌斯公式 k = Ae^(–Eₐ/RT) 表明速率常数如何随温度变化。

10. Practical & Analytical Terms | 实验与分析术语

Titration involves using a burette to deliver a titrant; the equivalence point is where stoichiometric amounts have reacted. End point is the colour change observed with an indicator. Chromatography separates components based on differing affinities for stationary and mobile phases; remember ‘Rf = distance travelled by spot / distance travelled by solvent’. Infrared spectroscopy identifies functional groups by absorption of IR radiation; think ‘fingerprint region’ for unique patterns. Mass spectrometry gives the molecular ion peak (M⁺) and fragmentation pattern — the base peak is the tallest peak set to 100%.

滴定使用滴定管加滴定剂；等当点是计量反应停止的点。终点指指示剂颜色变化观察点。色谱法基于组分对固定相和流动相的不同亲和力进行分离；记住“Rf = 斑点移动距离 / 溶剂前沿移动距离”。红外光谱通过吸收红外辐射鉴别官能团；想“指纹区”为独特模式。质谱给出分子离子峰 (M⁺) 和碎片峰——基峰是最高峰，设为 100%。

Published by TutorHao | Chemistry Revision Series | aleveler.com

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